*
* Authors:
* Jonathan Pryor (jonpryor@vt.edu)
+ * Jonathan Pryor (jpryor@novell.com)
+ * Tim Jenks (tim.jenks@realtimeworlds.com)
*
* Copyright (C) 2004-2005 Jonathan Pryor
+ * Copyright (C) 2008 Novell, Inc.
*/
#include <signal.h>
#include "map.h"
#include "mph.h"
+#ifndef HOST_WIN32
+#include <sys/time.h>
+#include <sys/types.h>
+#if defined(__APPLE__)
+#include "fakepoll.h"
+#else
+#include <poll.h>
+#endif
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+#include <mono/io-layer/atomic.h>
+#include <mono/metadata/appdomain.h>
+#endif
+
G_BEGIN_DECLS
typedef void (*mph_sighandler_t)(int);
+typedef struct Mono_Unix_UnixSignal_SignalInfo signal_info;
+
+static int count_handlers (int signum);
void*
Mono_Posix_Stdlib_SIG_DFL (void)
_h (signum);
}
-#ifndef PLATFORM_WIN32
+int Mono_Posix_SIGRTMIN (void)
+{
+#ifdef SIGRTMIN
+ return SIGRTMIN;
+#else /* def SIGRTMIN */
+ return -1;
+#endif /* ndef SIGRTMIN */
+}
+
+int Mono_Posix_SIGRTMAX (void)
+{
+#ifdef SIGRTMAX
+ return SIGRTMAX;
+#else /* def SIGRTMAX */
+ return -1;
+#endif /* ndef SIGRTMAX */
+}
+
+int Mono_Posix_FromRealTimeSignum (int offset, int *r)
+{
+ if (NULL == r) {
+ errno = EINVAL;
+ return -1;
+ }
+ *r = 0;
+#if defined (SIGRTMIN) && defined (SIGRTMAX)
+ if ((offset < 0) || (SIGRTMIN > SIGRTMAX - offset)) {
+ errno = EINVAL;
+ return -1;
+ }
+ *r = SIGRTMIN+offset;
+ return 0;
+#else /* defined (SIGRTMIN) && defined (SIGRTMAX) */
+# ifdef ENOSYS
+ errno = ENOSYS;
+# endif /* ENOSYS */
+ return -1;
+#endif /* defined (SIGRTMIN) && defined (SIGRTMAX) */
+}
+
+#ifndef HOST_WIN32
+
+#ifdef WAPI_ATOMIC_ASM
+ #define mph_int_get(p) InterlockedExchangeAdd ((p), 0)
+ #define mph_int_inc(p) InterlockedIncrement ((p))
+ #define mph_int_dec_test(p) (InterlockedDecrement ((p)) == 0)
+ #define mph_int_set(p,o,n) InterlockedExchange ((p), (n))
+#elif GLIB_CHECK_VERSION(2,4,0)
+ #define mph_int_get(p) g_atomic_int_get ((p))
+ #define mph_int_inc(p) do {g_atomic_int_inc ((p));} while (0)
+ #define mph_int_dec_test(p) g_atomic_int_dec_and_test ((p))
+ #define mph_int_set(p,o,n) do { \
+ while (!g_atomic_int_compare_and_exchange ((p), (o), (n))) {} \
+ } while (0)
+#else
+ #define mph_int_get(p) (*(p))
+ #define mph_int_inc(p) do { (*(p))++; } while (0)
+ #define mph_int_dec_test(p) (--(*(p)) == 0)
+ #define mph_int_set(p,o,n) do { *(p) = n; } while (0)
+#endif
+
+#if HAVE_PSIGNAL
int
Mono_Posix_Syscall_psignal (int sig, const char* s)
{
psignal (sig, s);
return errno == 0 ? 0 : -1;
}
-#endif /* ndef PLATFORM_WIN32 */
+#endif /* def HAVE_PSIGNAL */
+
+#define NUM_SIGNALS 64
+static signal_info signals[NUM_SIGNALS];
+
+static int acquire_mutex (pthread_mutex_t *mutex)
+{
+ int mr;
+ while ((mr = pthread_mutex_lock (mutex)) == EAGAIN) {
+ /* try to acquire again */
+ }
+ if ((mr != 0) && (mr != EDEADLK)) {
+ errno = mr;
+ return -1;
+ }
+ return 0;
+}
+
+static void release_mutex (pthread_mutex_t *mutex)
+{
+ int mr;
+ while ((mr = pthread_mutex_unlock (mutex)) == EAGAIN) {
+ /* try to release mutex again */
+ }
+}
+
+static inline int
+keep_trying (int r)
+{
+ return r == -1 && errno == EINTR;
+}
+
+static void
+default_handler (int signum)
+{
+ int i;
+ for (i = 0; i < NUM_SIGNALS; ++i) {
+ int fd;
+ signal_info* h = &signals [i];
+ if (mph_int_get (&h->signum) != signum)
+ continue;
+ mph_int_inc (&h->count);
+ fd = mph_int_get (&h->write_fd);
+ if (fd > 0) {
+ int j,pipecounter;
+ char c = signum;
+ pipecounter = mph_int_get (&h->pipecnt);
+ for (j = 0; j < pipecounter; ++j) {
+ int r;
+ do { r = write (fd, &c, 1); } while (keep_trying (r));
+ fsync (fd); /* force */
+ }
+ }
+ }
+}
+
+static pthread_mutex_t signals_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+void*
+Mono_Unix_UnixSignal_install (int sig)
+{
+ int i;
+ signal_info* h = NULL;
+ int have_handler = 0;
+ void* handler = NULL;
+
+ if (acquire_mutex (&signals_mutex) == -1)
+ return NULL;
+
+#if defined (SIGRTMIN) && defined (SIGRTMAX)
+ /*The runtime uses some rt signals for itself so it's important to not override them.*/
+ if (sig >= SIGRTMIN && sig <= SIGRTMAX && count_handlers (sig) == 0) {
+ struct sigaction sinfo;
+ sigaction (sig, NULL, &sinfo);
+ if (sinfo.sa_handler != SIG_DFL || (void*)sinfo.sa_sigaction != (void*)SIG_DFL) {
+ pthread_mutex_unlock (&signals_mutex);
+ errno = EADDRINUSE;
+ return NULL;
+ }
+ }
+#endif /*defined (SIGRTMIN) && defined (SIGRTMAX)*/
+
+ for (i = 0; i < NUM_SIGNALS; ++i) {
+ if (h == NULL && signals [i].signum == 0) {
+ h = &signals [i];
+ h->handler = signal (sig, default_handler);
+ if (h->handler == SIG_ERR) {
+ h->handler = NULL;
+ h = NULL;
+ break;
+ }
+ else {
+ h->have_handler = 1;
+ }
+ }
+ if (!have_handler && signals [i].signum == sig &&
+ signals [i].handler != default_handler) {
+ have_handler = 1;
+ handler = signals [i].handler;
+ }
+ if (h && have_handler)
+ break;
+ }
+
+ if (h && have_handler) {
+ h->have_handler = 1;
+ h->handler = handler;
+ }
+
+ if (h) {
+ mph_int_set (&h->count, h->count, 0);
+ mph_int_set (&h->signum, h->signum, sig);
+ mph_int_set (&h->pipecnt, h->pipecnt, 0);
+ }
+
+ release_mutex (&signals_mutex);
+
+ return h;
+}
+
+static int
+count_handlers (int signum)
+{
+ int i;
+ int count = 0;
+ for (i = 0; i < NUM_SIGNALS; ++i) {
+ if (signals [i].signum == signum)
+ ++count;
+ }
+ return count;
+}
+
+int
+Mono_Unix_UnixSignal_uninstall (void* info)
+{
+ signal_info* h;
+ int r = -1;
+
+ if (acquire_mutex (&signals_mutex) == -1)
+ return -1;
+
+ h = info;
+
+ if (h == NULL || h < signals || h > &signals [NUM_SIGNALS])
+ errno = EINVAL;
+ else {
+ /* last UnixSignal -- we can unregister */
+ if (h->have_handler && count_handlers (h->signum) == 1) {
+ mph_sighandler_t p = signal (h->signum, h->handler);
+ if (p != SIG_ERR)
+ r = 0;
+ h->handler = NULL;
+ h->have_handler = 0;
+ }
+ h->signum = 0;
+ }
+
+ release_mutex (&signals_mutex);
+
+ return r;
+}
+
+static int
+setup_pipes (signal_info** signals, int count, struct pollfd *fd_structs, int *currfd)
+{
+ int i;
+ int r = 0;
+ for (i = 0; i < count; ++i) {
+ signal_info* h;
+ int filedes[2];
+
+ h = signals [i];
+
+ if (mph_int_get (&h->pipecnt) == 0) {
+ if ((r = pipe (filedes)) != 0) {
+ break;
+ }
+ h->read_fd = filedes [0];
+ h->write_fd = filedes [1];
+ }
+ mph_int_inc (&h->pipecnt);
+ fd_structs[*currfd].fd = h->read_fd;
+ fd_structs[*currfd].events = POLLIN;
+ ++(*currfd);
+ }
+ return r;
+}
+
+static void
+teardown_pipes (signal_info** signals, int count)
+{
+ int i;
+ for (i = 0; i < count; ++i) {
+ signal_info* h = signals [i];
+
+ if (mph_int_dec_test (&h->pipecnt)) {
+ if (h->read_fd != 0)
+ close (h->read_fd);
+ if (h->write_fd != 0)
+ close (h->write_fd);
+ h->read_fd = 0;
+ h->write_fd = 0;
+ }
+ }
+}
+
+static int
+wait_for_any (signal_info** signals, int count, int *currfd, struct pollfd* fd_structs, int timeout, Mono_Posix_RuntimeIsShuttingDown shutting_down)
+{
+ int r, idx;
+ do {
+ struct timeval tv;
+ struct timeval *ptv = NULL;
+ if (timeout != -1) {
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout % 1000)*1000;
+ ptv = &tv;
+ }
+ r = poll (fd_structs, count, timeout);
+ } while (keep_trying (r) && !shutting_down ());
+
+ idx = -1;
+ if (r == 0)
+ idx = timeout;
+ else if (r > 0) {
+ int i;
+ for (i = 0; i < count; ++i) {
+ signal_info* h = signals [i];
+ if (fd_structs[i].revents & POLLIN) {
+ int r;
+ char c;
+ do {
+ r = read (h->read_fd, &c, 1);
+ } while (keep_trying (r) && !shutting_down ());
+ if (idx == -1)
+ idx = i;
+ }
+ }
+ }
+
+ return idx;
+}
+
+/*
+ * returns: -1 on error:
+ * timeout on timeout
+ * index into _signals array of signal that was generated on success
+ */
+int
+Mono_Unix_UnixSignal_WaitAny (void** _signals, int count, int timeout /* milliseconds */, Mono_Posix_RuntimeIsShuttingDown shutting_down)
+{
+ int r;
+ int currfd = 0;
+ struct pollfd fd_structs[NUM_SIGNALS];
+
+ signal_info** signals = (signal_info**) _signals;
+
+ if (count > NUM_SIGNALS)
+ return -1;
+
+ if (acquire_mutex (&signals_mutex) == -1)
+ return -1;
+
+ r = setup_pipes (signals, count, &fd_structs[0], &currfd);
+
+ release_mutex (&signals_mutex);
+
+ if (r == 0) {
+ r = wait_for_any (signals, count, &currfd, &fd_structs[0], timeout, shutting_down);
+ }
+
+ if (acquire_mutex (&signals_mutex) == -1)
+ return -1;
+
+ teardown_pipes (signals, count);
+
+ release_mutex (&signals_mutex);
+
+ return r;
+}
+
+#endif /* ndef HOST_WIN32 */
G_END_DECLS
projects / mono.git / blobdiff